CVE-2026-54917
HighPublic exploitPrior to 4.30, the S3 API gateway and the Iceberg REST catalog gateway construct their routers with mux.NewRouter().SkipClean(true).
Published Jun 25, 2026 · Updated Oct 10, 2026 · Also known as BIT-seaweedfs-2026-54917, EUVD-2026-39535, GHSA-w62w-66v9-vvgv, GO-2026-6221
Key Facts
Patch immediately- CVE-2026-54917 is a high-severity vulnerability (CVSS 7.8 v4) affecting Seaweedfs, seaweedfs-cosi-driver (minimos), seaweedfs-cosi-driver-fips (minimos) and 1 more product.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 1.6% probability of exploitation in the next 30 days.
- Fixed versions are available, including github.com/seaweedfs/seaweedfs 0.0.0-20260526080459-dd1b4287899e, Seaweedfs 4.30, Seaweedfs 4.30.0.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
CVSS v4
7.8
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
EPSS (30-day exploit likelihood)
1.6%
Higher than 75.9% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-54917 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables. Prior to 4.30, the S3 API gateway and the Iceberg REST catalog gateway construct their routers with mux.NewRouter().SkipClean(true). With path cleaning disabled, a .. segment inside the URL survives routing, so a request such as GET /bucket-A/../evil-bucket/key, is matched as bucket=bucket-A, object=../evil-bucket/key. The captured object key is then joined into a filer path with util.JoinPath (S3) / path.Join (Iceberg), which collapse the .. server-side, so the actual read or write lands in evil-bucket. This vulnerability is fixed in 4.30.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| SeaweedfsSeaweedfs | See advisory | 4.30 |
| seaweedfs-cosi-driverminimos | See advisory | 0.3.1-r7 |
| seaweedfs-cosi-driver-fipsminimos | See advisory | 0.3.1-r7 |
| github.com/seaweedfs/seaweedfsgo | See advisory | 0.0.0-20260526080459-dd1b4287899e |
Patched Releases
github.com/seaweedfs/seaweedfs
0.0.0-20260526080459-dd1b4287899e
Seaweedfs
4.30, 4.30.0, 4.34.0
seaweedfs-cosi-driver
0.3.1-r7
seaweedfs-cosi-driver-fips
0.3.1-r7
Timeline
Publicly disclosed
Jun 25, 2026
Last updated
Oct 10, 2026
Weakness Type
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
References
- advisoryGHSA advisory
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54917.json
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58372.json
- advisoryhttps://github.com/seaweedfs/seaweedfs/releases/tag/4.34
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-58372
FAQ
Common Questions.
SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables.
Affected: Seaweedfs; seaweedfs-cosi-driver (minimos); seaweedfs-cosi-driver-fips (minimos), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including github.com/seaweedfs/seaweedfs 0.0.0-20260526080459-dd1b4287899e, Seaweedfs 4.30, Seaweedfs 4.30.0.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
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